Effect of High-Dose Zinc and Ascorbic Acid Supplementation vs Usual Care on Symptom Length and Reduction Among Ambulatory Patients With SARS-CoV-2 Infection: The COVID A to Z Randomized Clinical Trial
Thomas et al., JAMA Network Open, doi:10.1001/jamanetworkopen.2021.0369
https://c19early.org/thomasc.html